A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Sean C
Date: 2016 May 27, 01:40 -0700
Another way of illustrating the length of a day at various times throughout the year is my personal favorite...the diagram on the plane of the meridian. In the attached sample, set at 50° north latitude, one can see from the portion of black 'declination lines' which is above the red 'N-S' line (the horizon) how the amount of time the sun is above the horizon changes with declination. As an added bonus, one can see how the azimuth of the rising/setting sun changes and the difference in culmination altitudes.